public class MyUtilTest {
    public static void main(String[] args) {
        if(MyUtil.percentage2fivegrade(33) != "不及格")// 成绩是33时应该返回“不及格”
            System.out.println("test failed!");
        else if(MyUtil.percentage2fivegrade(75) != "中等")//成绩是75时应该返回“中等”
            System.out.println("test failed!");
        else
            System.out.println("test passed!");
    }
}